The aim of this study is to confirm the importance of a more immediate advanced cardiac life support (ACLS) through a comparative analysis of the results of cardiopulmonary resuscitation (CPR) according to the occurrence place of cardiac arrest in tertiary emergency department. The subjects were 493 patients who had received CPR in Chosun university, Emergency Medical Department, between April 2013 and March 2015. The subjects were categorized into three groups according to the occurrence place of cardiac arrest: pre-hospital, in-emergency room, and in-ward. We conducted a clinical analysis of the results. During the period, 493 cardiac arrest patients underwent CPR, 63 patients (12.8%) were discharged alive and 41 patients (8.3%) got a good score on the cerebral performance category (CPC). Concerned occurrence place of cardiac arrest, 11.3% (16 patients) of the in-emergency room group (total 288 patients) were discharged alive. Also, 9.4% (27 patients) of the In-emergency room group got a good score on the CPC. In the other two-group cases, 7.1% (10 patients) of pre-hospital group (total 141 patients) and 6,2% (4 patients) of in-ward group (total 64 patients) got a good score on the CPC. These results indicate that both the rates of alive discharge and a good CPC score of the in-emergency room group are higher than in out-of-emergency room. This difference might be due to the fact that patients could get the more immediate ACLS by emergency medicine doctors if cardiac arrest occurs in emergency room than other places.